Standardise & styles and improve performance on small displays.

Add inter-route linking from Junctions.

src/lib/components/mapIcons/Crossing.svelte

@@ -9,10 +9,9 @@
 
 	$: type = feature.kind.toLowerCase();
 	$: isFoot = type === 'foot';
-	$: filterCategory = isFoot ? 'foot' : type === 'uwc' ? 'uwc' : 'level-crossing';
 </script>
 
-<svg viewBox="0 0 64 64" width="64" height="64" class={filterCategory}>
+<svg viewBox="0 0 64 64" width="64" height="64">
 	<BaseTrack {activeElec} height={64} />
 
 	{#if type === 'foot'}